body { font-family: 'Helvetica Neue', Arial, sans-serif; line-height: 1.8; max-width: 800px; margin: 0 auto; padding: 20px; color: #333; } h1 { color: #1a1a1a; border-bottom: 3px solid #2196F3; padding-bottom: 10px; } h2 { color: #2196F3; margin-top: 40px; border-left: 5px solid #2196F3; padding-lef…